Organize backend into product executable and shared Go modules

backend/shared/database/dependencies/dependencies.go

@@ -0,0 +1,34 @@
+package mongo
+
+import (
+	"git.sendico.io/tech/sxchnge/shared/database"
+	"git.sendico.io/tech/sxchnge/shared/database/transaction"
+	"git.sendico.io/tech/sxchnge/shared/errors"
+	"go.mongodb.org/mongo-driver/v2/mongo"
+)
+
+// Dependencies resolves local DB/transaction primitives for edge-local store wiring only.
+type Dependencies struct {
+	Database     *mongo.Database
+	Transactions transaction.Factory
+}
+
+type DatabaseProvider interface {
+	MongoDatabase() *mongo.Database
+}
+
+func ResolveDependencies(dbf db.Factory) (*Dependencies, error) {
+	if dbf == nil {
+		return nil, merrors.InvalidArgument("database factory is required", "dbFactory")
+	}
+
+	provider, ok := dbf.(DatabaseProvider)
+	if !ok || provider.MongoDatabase() == nil {
+		return nil, merrors.Internal("mongo database provider is not available for edge-local storage wiring")
+	}
+
+	return &Dependencies{
+		Database:     provider.MongoDatabase(),
+		Transactions: dbf.TransactionFactory(),
+	}, nil
+}